Civil infrastructure objects are subject to safety-related issues such as increasing loads and extended service live. Costly manual inspections of these structures should therefore be supplemented by automated continuous monitoring. In this work, a hardwareaccelerated wireless sensor network built entirely with energy-efficient embedded components is proposed as the basis for a distributed stru...

0141-0296/$ see front matter 2012 Elsevier Ltd. A http://dx.doi.org/10.1016/j.engstruct.2012.03.013 ⇑ Corresponding author. Tel.: +351 22 508 1901; fa E-mail addresses: [email protected] (D. Ribeiro), r [email protected] (R. Delgado), [email protected] uni-weimar.de (V. Zabel). This article describes the calibration of the numerical model of a bowstring-arch railway bridge based on modal param...

Keywords: Frequencies and mode shapes Component mode synthesis Craig–Bampton scheme Bathe subspace iteration method Control of errors a b s t r a c t The objective in this paper is to present an approach to improve component mode synthesis solutions using subspace iterations to obtain frequency and mode shape predictions of controlled accuracy. In traditional component mode synthesis analyses, ...

The introduction and development of wireless sensor network technology has resulted in rapid growth within the field of structural health monitoring (SHM), as the dramatic cable costs associated with instrumentation of large civil structures is potentially alleviated. Traditionally, condition assessment of bridge structures is accomplished through the use of either vibration measurements or str...

The dynamic behaviour of a circular plate in contact with fluid and resting on two-parameter elastic foundations is of interest in the field of geotechnics, structure, highway, railway, oil and gas and mechanical engineering. In this work, the dynamic behaviour of circular plate in contact with fluid and resting on Winkler and Pasternak foundations is investigated. The coupled differential equa...

The free vibration analysis of simply supported box-girder bridges is carried out using the finite element method. fundamental frequency determined in straight, skew, curved and skew-curved bridges. It important to analyse combined effect skewness curvature because bridge behaviour cannot be predicted by adding individual effects curvature. At first, an existing model considered validate presen...

One of the major problems in experimental vibration analysis is to determine location of transducers. It is important to place the transducers on locations with largest vibration amplitude and to avoid locations with zero-movement (nodal lines). These locations are best seen from vibration mode shapes. Finite element analysis (FEA) provides numerical values for natural frequencies, which are so...

Dynamic properties of civil structures such as natural frequencies, damping ratios, and mode shapes are essential parameters for evaluating the health condition structures. However, dynamic prone to be biased by environmental effects which may lead fault structural assessment. To investigate effect on ballasted bridge, in this paper, a series vibration experiments were performed multi-span pre-...

Effect of electro migration on crystal structures of platinum nanowire (Nano bridge) during Nano-gap formation is investigated by means of Transmission Electron Microscopy (TEM). Selected area diffraction patterns as well as bright field images are used for this investigation. There were severely recessions in the polycrystalline Nano bridge and crystal structures around the nanogap changed ...

Scheduling in piconets has emerged as a challenging research area. Interpiconet scheduling focuses on when a bridge is switched among various piconets and how a bridge node communicates with the masters in different piconets. This paper proposes an interpiconet scheduling algorithm named, hold mode based dynamic traffic priority load adaptive scheduling. The bridges are adaptively switched betw...